The mother of all aftermarket parts shops is still JCWhitney in Chicago...... Here's one that will also give you screw on cannister filter as part of the deal -
http://www.jcwhitney.com/webapp/wcs/stores/servlet/ProductDisplay?Dx=mode+matchall&productId=5375&catalogId=10101&Ntx=mode+matchallany&langId=-1&storeId=10101
Otherwise you might try cannibalizing junkyard w123 diesel oil cooler and hoses (MB stock items).... then drill and tap your own hose fittings into your existing oil filter bracket.
Am reasonably familiar with 111/110 cars and recall legendary 'Africa' modifications that include oil coolers, oil bath air filters, auxilliary radiator fans and extra large fuel tanks..... check with MBUSA and you might get lucky at importing the actual product from somewhere.